I have used Sentinel Spectrum for many years and have seen zero side affects.
The product works well and we not had fleas or worms.
I highly recommend it from puppy through to an aged dog.

We’ve had our mixed breed on Sentinel his whole life (8 yrs), and we are suddenly having a flea problem. He doesn’t have a history of fleas. I don’t know if the formula changed, or what happened, but lately it seems that the Sentinel isn’t even stopping the cycle. If I have to buy a separate pill for fleas, then what is the point to keep buying this?

My healthy happy 7.5 year old english bulldog started having seizures 8 hours after first dose. 2 months later she is on seizure meds and still suffering. Terrible chemical.

We can't persuade our dog to take this med, even when coated in peanut butter, pill pockets or cheese. She eats the good stuff and leaves the med. If we chop it up and mix it with anything else she won't eat it. It's a monthly trial and we need a better product.

Not worth the price if you cannot receive a rebate. Paid over $100 for 12 months and was denied rebate because purchased at a warehouse.

I have a aussie, and just tried sentinel for heart worms and fleas, he now has sores and is constantly scratching, I have always kept him clean and groomed, I will never buy this product again and I would like my refund for the years supply I purchased. My dog is miserable and I am a mad woman. this dog has never had any sores on his body in his six years, I need a response from your company ASAP

I haven't noticed any difference in fleas, although he didn't have many in the first place, only got this product to prevent them as we live in a wooded area but i have noticed that my 3 month old Great Pyrenees/Catahoula mix puppy has been itching and now has some patches coming up that look like burns. It was his second vet visit and i received one monthly tablet to try for free, i wish i had read reviews beforehand. Any advice on what to do? I've never had a puppy have adverse effects from medicine.

Have been using this for my two lagottos for nearly six years. One was rather wormy when we first got her but both have had no sign of pests since then .One was a bit loose in the bowels after dosing but I then realised that I should give it after her main meal not before, or with, and she is now fine.This same dog loves to eat them but the other dog must be enticed to eat the chew by putting it in a butter ball.

I have used this on my pug since he was born. He has no issued with the chew, eats it like it's a treat and has no issues. Has never had any fleas, worms or anything. Will be sticking with this one for life.

What good is a tablet the dog won't eat. This is too expensive. No more Sentinel for my pets.

I was given a beautiful Staffy/cross by my daughter, 5 years ago. Today she is gone. I had her on Sentinel for Heart Worm Preventative. Yesterday my vet told me, they no longer sell it because it doesn't work. They tested Charly and yes, she has Heart Worm. My friend, comforter and protector. This product does not work and I feel like I have let Charly down. I'm devastated. This company should be made pay for all the lived they have ruined.

I tried every way of giving this to our staffy and she hated it every time, Very frustrating as it's no cheap. Will be looking for an alternative next time.

We have three dogs, shih tzu, weimeraner and beagle and all three have been on sentinel since they were puppies. We have never had any fleas on our dogs and never had any instances of worms or parasites. The fact that all of this is built right in to their heartworm medication that we give every month anyway is a huge plus to me. The only downside is they dont really take them when given as treats. I just put the pill inside a little dab of peanutbutter for each of them. Works like a charm. Would definitely recommend.

My 11 year old beagle springer spaniel cross has been on Sentinal for 5 years and in that time has never had a flea. Prior to that I tried Frontline which worked for a while then failed, and Advantix which didn't work at all. He doesn't like the taste of the chews but takes them no problem if I cut them in half and embed them in a piece of fetta cheese which he adores - to take them I make him sit or lie down or do anything else that he usually might get a treat for and he just gobbles them up! Also have had no intestinal worm problems and it is his sole heartworm protection as he is a total nightmare at the vet and needs sedation to have an injection. Love it!